1240663406 has 8 divisors (see below), whose sum is σ = 1958942280. Its totient is φ = 587682648.

The previous prime is 1240663363. The next prime is 1240663409. The reversal of 1240663406 is 6043660421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240663409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16324481 + ... + 16324556.

It is an arithmetic number, because the mean of its divisors is an integer number (244867785).

Almost surely, 2^1240663406 is an apocalyptic number.

1240663406 is a deficient number, since it is larger than the sum of its proper divisors (718278874).

1240663406 is a wasteful number, since it uses less digits than its factorization.

1240663406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32649058.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1240663406 is about 35223.0521959696. The cubic root of 1240663406 is about 1074.5286286754.

The spelling of 1240663406 in words is "one billion, two hundred forty million, six hundred sixty-three thousand, four hundred six".